Earthquake · reviewed by a seismologist
M 1.5ml
Earthquake near Muscoy, CA
No earthquake was likely felt in Muscoy in the 24 hours to 8:11 am PST (16:11 UTC). The last one was M 2.2, 17 km (10 mi) SE, at 8:15 pm PDT on 29 October 2026, estimated intensity II (weak) in town; 1 felt report to USGS. Every earthquake near Muscoy
This page: a magnitude 1.5 earthquake was recorded 7 km (4 mi) west of Muscoy, CA, at 8:15 am PDT on 10 April 2025 (15:15 UTC), 9.6 km deep. 1 person has reported feeling it to USGS.
USGS: 7 km W of Muscoy, CA
5 km (3 mi) NNW of Rialto, CA · 93 km (58 mi) E of Los Angeles, CA
- When
- 8:15 am PDT on 10 April 2025 ()
- Where
- 7 km (4 mi) west of Muscoy, CA · earthquakes near Muscoy
- Magnitude
- M 1.5 (ml)
- Depth
- 9.6 km below the surface
- Felt
- 1 report
- Nearest
- Orange County, 63 km SSW
- Nearest mapped fault
- San Jacinto fault, 1 km from its surface trace — near is not the same as on
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 580 days ago
Earthquake alerts for Muscoy, CA
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Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 4 km (2 mi) from the epicentre. In Muscoy, 7 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.
Earthquakes near other towns within 30 km: Rialto, Fontana, Bloomington, San Bernardino, Colton, Crestline.
How big was it?
This earthquake released about 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.6 lb of TNT
Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.
For this area
The largest earthquake within 50 km since 2016 was M 4.4 on 2018-08-29 — about 20,000 times the energy of this one.
Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 3 km SE of San Bernardino, California · 16 km ESE of this epicentre
- 5.6 7km ENE of Running Springs, CA · 36 km ENE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 26 km W of this epicentre
- 5.4 5km S of Chino Hills, CA · 40 km SW of this epicentre
- 5.3 Near San Bernardino, California · 29 km E of this epicentre
Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.
Where
Epicentre 34.1595, -117.4165. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 63 km (39 mi) | SSW | earthquakes near Orange County |
| Los Angeles County, CA | 78 km (48 mi) | W | earthquakes near Los Angeles County |
| San Bernardino County, CA | 137 km (85 mi) | NE | earthquakes near San Bernardino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 2.1 13 km SSW of Lucerne Valley, CA
- 1.7 8 km N of Upland, CA
- 1.5 4 km NNW of Colton, CA
- 1.7 9 km SE of Running Springs, CA
- 1.6 2 km WSW of Muscoy, CA
- 2.0 4 km SE of Home Gardens, CA
- 1.8 3 km SW of San Bernardino, CA
- 1.6 8 km SW of Lytle Creek, CA
- 1.7 4 km SSW of Calimesa, CA
- 1.5 7 km SSE of Home Gardens, CA
- 1.8 4 km NNW of Colton, CA
- 1.7 5 km SSE of Home Gardens, CA
- 2.6 7 km SSW of Calimesa, CA
- 2.7 6 km SE of Redlands, CA
- 2.6 4 km NNW of Lytle Creek, CA
Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.
On USGS
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.